使用java语言，本题要求编写复数类，该类至少包括加法、减法、乘法、除法的方法。还要编写ComplexDivException类，该类继承自Exception类，且至少包含两个数据成员，一个为错误代码，一个为错误信息。当复数类除数为0时，需要抛出该异常。编写测试类，测试以上两个类。

好的，这是一个Java编程的问题，我会尽力回答。下面是我的解答：

// 复数类
public class Complex {
    private double real;
    private double imaginary;

    public Complex(double real, double imaginary) {
        this.real = real;
        this.imaginary = imaginary;
    }

    public Complex add(Complex other) {
        double real = this.real + other.real;
        double imaginary = this.imaginary + other.imaginary;
        return new Complex(real, imaginary);
    }

    public Complex subtract(Complex other) {
        double real = this.real - other.real;
        double imaginary = this.imaginary - other.imaginary;
        return new Complex(real, imaginary);
    }

    public Complex multiply(Complex other) {
        double real = this.real * other.real - this.imaginary * other.imaginary;
        double imaginary = this.imaginary * other.real + this.real * other.imaginary;
        return new Complex(real, imaginary);
    }

    public Complex divide(Complex other) throws ComplexDivException {
        double denominator = other.real * other.real + other.imaginary * other.imaginary;
        if (denominator == 0) {
            throw new ComplexDivException(1, "Divisor can not be zero.");
        }
        double real = (this.real * other.real + this.imaginary * other.imaginary) / denominator;
        double imaginary = (this.imaginary * other.real - this.real * other.imaginary) / denominator;
        return new Complex(real, imaginary);
    }

    @Override
    public String toString() {
        return real + " + " + imaginary + "i";
    }
}

// 复数除法异常类
public class ComplexDivException extends Exception {
    private int errorCode;
    private String errorMessage;

    public ComplexDivException(int errorCode, String errorMessage) {
        this.errorCode = errorCode;
        this.errorMessage = errorMessage;
    }

    public int getErrorCode() {
        return errorCode;
    }

    public String getErrorMessage() {
        return errorMessage;
    }
}

// 测试类
public class ComplexTest {
    public static void main(String[] args) {
        Complex a = new Complex(3, 4);
        Complex b = new Complex(1, 2);
        try {
            Complex c = a.divide(b);
            System.out.println(a + " / " + b + " = " + c);
        } catch (ComplexDivException e) {
            System.out.println("Error: " + e.getErrorCode() + ", " + e.getErrorMessage());
        }
    }
}

这个程序中，我们定义了一个复数类 `Complex`，包含复数的实部和虚部，以及加法、减法、乘法和除法的方法。在除法方法中，当除数为0时，会抛出 `ComplexDivException` 异常。我们还定义了一个测试类 `ComplexTest`，用于测试 `Complex` 和 `ComplexDivException` 类。在测试类中，我们创建了两个复数，然后进行除法运算，并处理可能出现的异常。

希望这个解答能够帮到你！